Mindfulness for Health: A practical guide to relieving pain, reducing stress and restoring wellbeing
by Vidyamala Burch and Danny Penman
I'm currently reading this and really impressed by it. Vidyamala Burch's work is essentially with people suffering chronic pain (through the Breathworks organisation) but this is actually a really good guide to the practice of mindfulness.
Light Mind: Mindfulness in daily living
by Padraig O'Morain
This mindfulness guide, by yours truly, aims to bring clarity and simplicity to the practice of mindfulness. So far as I know, it was the first Irish guide to mindfulness when published in 2009 and may still be.
The Joy of Living: Unlocking the Secret and Science of Happiness
by Yongey Mingyur Rinpoche
You're most likely to enjoy this book if you are already practicing mindfulness or interested in Buddhism. The author, a master of a lineage of Tibetan Buddhism takes a clear and friendly approach, recommending short mindfulness practices.
Sane new world
by Ruby Wax
This book, about Ruby Wax's psychological journey through some dark periods of her life, is funny, engaging and informative. The section on mindfulness is refreshingly free of piousness and bullshit.